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Deep, Clean Bass
The LDW7 woofer gives the 1TD-X bass extension and composure that many bookshelf speakers simply cannot match.
Smooth Detail
The LD25X tweeter delivers clarity and air without the harshness or fatigue that can make some detailed speakers hard to enjoy long term.
Proven Design
With rave reviews from customers and critics, the 1TD-X is the safe choice when you want a compact kit that does almost everything well.
Fully Engineered System
Not just parts. A complete speaker design.
The 1TD-X was designed as a full loudspeaker system, with the drivers, crossover, cabinet tuning, and damping all developed to work together. That matters because the final result is not determined by any one part—it is determined by how well everything integrates.
We handle the hard parts: driver selection, acoustic measurements, modeling, crossover design, and cabinet plans. You get the rewarding part: building a speaker that performs like a serious finished product.
What It Sounds Like
Full, natural, and surprisingly effortless.
The 1TD-X is designed for the customer who wants a bookshelf speaker that does not sound small. It has the bass weight to stand on its own in many rooms, the midrange clarity to make vocals feel natural, and the smooth detail needed for long listening sessions.
Deep bass for its size
Designed to reach low enough that many listeners do not immediately feel the need for a subwoofer.
Clean, stable imaging
The crossover and driver integration help create a cohesive soundstage rather than two drivers playing separately.
Low fatigue
Detailed enough to be revealing, but voiced to stay smooth and enjoyable over long listening sessions.
Choose Your Build Level
Build it your way.
Whether you want the lowest-cost kit, a simpler cabinet build, or a higher-end crossover package, the 1TD-X gives you options without changing the core performance of the design.
Base Kit
Best for experienced builders who want to cut their own cabinets using the supplied plans. This is the lowest-cost option, but requires more tools and woodworking skill.
Flat Pack Cabinets
Precision-cut cabinet panels simplify the build and help ensure accurate assembly. Choose MDF or Baltic Birch flat packs when available.
Crossover Options
Start with the excellent Standard crossover or step up to the Superior crossover with upgraded parts for customers who want the premium build from the beginning.
SmartNode Crossover Boards
A cleaner, easier crossover build.
Crossovers are one of the most intimidating parts of many DIY speaker builds. Our SmartNode boards make the process cleaner, more organized, and more repeatable by giving each component a clear place in the circuit.
That means fewer layout questions, fewer wiring mistakes, and a more confident build—especially for customers who want high-end sound but do not want to design a crossover from scratch.
What’s Included
Everything you need. Nothing you don’t.
The full kit includes everything needed to assemble your speakers except glue, solder, and finish materials. No sourcing drivers, no guessing on crossover values, and no wondering which parts work together.
Drivers & Acoustic Parts
- 2x CSS LD25X tweeters
- 2x CSS LDW7 woofers
- 2x 2" diameter port tubes
- Eggcrate foam damping material
Crossover & Wiring
- 2x CSS SmartNode crossover boards
- Crossover capacitors, inductors, and resistors
- Internal speaker wire
- Crossover hookup wire
- 2x pairs gold-plated binding posts
Hardware & Cabinet Options
- Screws
- Zip ties
- Cabinet plans
- Optional MDF flat pack cabinets
- Optional Baltic Birch flat pack cabinets when available
Specifications
Compact size. Serious extension.
Anechoic Response
40 Hz – 20 kHz
±3 dB
In-Room Response
30 Hz – 20 kHz
Typical in-room extension
Sensitivity
87 dB
2.83 V
Nominal Impedance
8 Ohm
Amplifier friendly
Where It Fits
The all-arounder in the CSS lineup.
The 1TD-X is the kit we recommend when someone wants a compact speaker that can do almost everything well. It reaches deep, images well, sounds smooth, and does not require a subwoofer to feel satisfying in many rooms.
If your main priority is the highest level of top-end refinement and detail retrieval, the Veritas One may be the better fit. If you want the most proven bookshelf kit with the strongest all-around balance of bass, clarity, value, and ease of ownership, the 1TD-X is still the benchmark.
Who This Kit Is For
A great fit for first-time and experienced builders.
The First Serious DIY Build
A complete, proven design that removes the uncertainty from choosing drivers, modeling cabinets, and designing a crossover.
The No-Sub Bookshelf Setup
For listeners who want real bass weight from a compact speaker and do not want to rely on a subwoofer for every system.
The Long-Term Value Buyer
For customers who want high-end performance without paying the retail markup of a comparable finished speaker.
Questions before you build?
If you are not sure which cabinet option, crossover package, or CSS kit is the right fit for your room and system, reach out and we will help point you in the right direction.
If you want the proven CSS bookshelf kit with the deepest, most complete presentation, the Criton 1TD-X is the place to start.
Build Documents
Plans, instructions, and build support.
We want the build process to be as straightforward as possible. Use the links below to review the cabinet plans, assembly instructions, and crossover documentation before or during your build.
Still have questions during your build? Reach out to us and we’ll help you get pointed in the right direction.
Reviews & Industry Feedback
See why the 1TD-X has earned so much attention.
The Criton 1TD-X has been reviewed by independent YouTube creators, audio enthusiasts, and measurement-focused communities. These reviews give you a broader look at the sound, build process, value, and real-world performance of the kit before starting your own project.
Featured Review
Jay’s Iyagi
This Time... I Built A DIY Speaker That DESTROY Expensive Speakers
Jay’s Iyagi takes the 1TD-X through the full DIY speaker experience, showing how a well-engineered kit can deliver serious high-end performance without the price tag of a finished retail speaker.
YouTube Review
Should we bow down to the King of Kit Speakers?
cheapaudioman highlights why the 1TD-X has become one of the most talked-about DIY speaker kits, with strong praise for its sound quality, value, and overall performance.
“OMG these are amazing.”
Reviewer: cheapaudioman
Watch on YouTube
YouTube Review
Honest, musical, and easy to enjoy.
Old Guy Hifi focuses on the musical side of the 1TD-X, describing a speaker that is balanced, engaging, and capable of strong real-world performance.
“honest & capable of great musical performance”
Reviewer: Old Guy Hifi
Watch on YouTube
YouTube Review
Is DIY really the right option?
Nemo Propaganda looks at the question many first-time builders ask: whether a DIY speaker kit can really make sense compared with buying a finished speaker.
A practical look at the 1TD-X from the perspective of real-world system building.
Reviewer: Nemo Propaganda
Watch on YouTube
YouTube Review
Endgame Bookshelf Speaker?
Tharbamar’s review frames the 1TD-X as the kind of compact speaker that can satisfy long term, especially for listeners who want serious performance without stepping into a much larger system.
A compelling “endgame bookshelf” perspective.
Reviewer: Tharbamar
Watch on YouTube
YouTube Review
Save money. Build monsters.
Z Reviews leans into one of the strongest reasons to build the 1TD-X: getting a serious speaker without paying the markup typically attached to finished high-end products.
“audiophile sound—without an audiophile price tag?”
Reviewer: Z Reviews
Watch on YouTube
YouTube Review
Built, listened to, and reviewed.
iiWi Reviews brings a builder/listener perspective to the 1TD-X, covering the experience of putting the kit together and evaluating the finished result.
“They offer excellent value.”
Reviewer: iiWi Reviews
Watch on YouTube
YouTube Review
Best value for money currently available.
hifihunters gives the 1TD-X a value-focused review, reinforcing why the kit has earned such a strong reputation with listeners looking for high performance per dollar.
“Best value for money currently available.”
Reviewer: hifihunters
Watch on YouTubeWritten Review / Measurements
Audio Science Review — CSS Criton 1TD-X Kit Speaker Review
Audio Science Review provides a measurement-focused look at the 1TD-X for customers who want technical discussion and objective data alongside listening impressions.
Source: Audio Science Review
Read ReviewMore Reviews, Builds & Mentions
Want to dig deeper? These additional videos include build logs, finish work, comparisons, follow-up impressions, and related 1TD-X coverage.
- Build It Better! CSS 1TD-X Build - Part 1 — Matt Coykendall
- The BEST Dressed Speaker, Piano Black Finish On A Budget - CSS 1TDX Part 2 — Matt Coykendall
- RUN Don't Walk To This Speaker - Seriously - CSS 1TDX Part 3 — Matt Coykendall
- CSS Criton 1TDX Crossover & Cabinet Assembly — Tharbamar
- DIY Speaker Kit vs B&W 706 S2 Speaker Comparison — Tharbamar
- A DIY SPEAKER THAT CHANGES THINGS?!?! — ABX Audiophiles
- CSS Criton 1TDX Superior Kit Final Assembly — Builder follow-up
- Refinishing and Revisiting CSS Audio 1TD-X Bookshelf Speaker — Revisit / finish update
- He Didn't Believe This DIY Speaker Can DESTROY... — Jay’s Iyagi related coverage
